Triarylmethane dyes



ll ll l 3- i v 3: l iE Bimin M A u We Drawing.

to which it appertuins 20 make and use the some.

This invention. relates to "the manufacture and procluction of new acid dyestuffs which belong to the izriphenylmetiiane series and which are of value for dyeing, from on scnl both, silk and Wool whereas they leave cotton and artificial silk substantially unstained. They are also capable of forming lakes. The invention includes also th dyed fabrics, or other material, (lyed with she new (lycstulis.

Tile new (lyestniis can be o ominecl by condensation of N-hydi'oxyetliyl rlerivatives of aromatic secondary amines with sulfonic acid derivatives of aromatic ulclehydes and subsequent oxidation of the thus obtained leuco com sounds. The new dyestufis in the free state have the following pyobable formula:

(spam. wherein 1? denotes an orylgroup, X a lig drogen atom or on slkyl group or on ai'ulkyl group which may or may not contain sulfo groups and n a Whole numloez' whose value is 1 or 2.

The dyestufis thus oblsins'ole are prob.- ebly in the form of their sodium salts a-ii(l are. powders of a metallic lustre, soluble in Water generallywith a greenish to bluish coloration, insoluble in ether and in ligroiu, and soluble in concentrated sulfuric ocicl with a yellowish to reddish coloration. They dye silk or wool from an acid loath green to blue shades whereas they leave cotton or artificial silk practically unstained. By reduction with zinc and hydrochloric ecici they lppmco'tion filed ectooeie1, sum 2 50.

'oxide of ($9.31 per oen nnity and. will) are reduced "50 he correspondingleuco compounds.

The following" specific example will iilustrete the invention, but i: is nmlcrstoml um ilic invention no? limited thereto. The parts by Weight.

Example: 90 parts of i l-liydroxyeihyl benzyluniline is lieu'lcil with 5'2, parts of benzuixleliydei.5-disulfonic we anti 1000 so parts of easier in s YESSEl pi" viileii with reflux condenser for 30 llOllI'S boiling lempemhn-e, he mixture lieing; constantly" siim'eci. When. the comieusution is complete. the reaction-product, which consists cliiejiy of the leuco compouncl. is filteiecl o and 'uslied with water. The prozluci then suspeniled in 500 parts Water on WilllSll stirring. sodium hydroxide solution slowly eclcled until the solution becomes slightly slimline. in reaction the leuco compound has dissolved. The solution is then fillei'ccl and the filtrate QXiL'l'ilCil8(l once or iwice Willi benzene inv order to remove any N-hyclrosyethyllienzylaniline which may be pzesoni. The lenco compound is than precipitateil from the aqueous solution by the addition of dilute sulfuric acid, and is filtered oil and Weshen The leuco compound may be conveitecl into the dyestuff la oxidation in the following manner: psi-'52s of this leuco compound are dissolved in 900 porisof water containing sufficient sodium liyclioizicle to effect solution and render it slightly alkaline toward nlienol- Philllllfilll as indicator. l0 parts of lee ieas in of water on: then. elcle ti to the solution, encl time 50 psris of u nciii. flit-er stirring for abonc ulzes, 4:0 .ps'rts anhydrous socliuui sulfate 1..

added, snrl the sin-Ting continued about ill-minutes longer. T lescl snlfele is then filtered of? cool the dycsiuff sslseii out from the filtrate by she sclcli'ziou of common sell. it is filtered off, \e-siiecl end clriecl. in the clry and powdered state, it is a, blue powder with a reddish tinge, eusily soluble in Water or in alcohol "Willi s greenish-blue coloration, and soluble in concemru'izecl sulfuric cold. with a yellowish coloration which upon gceflusl with ice oi changes in color to orange, reddish-brown, ellowish-green, and finally to a greenish Inc. The new dyestuff hasmost probably the following formula:

(HO)CH1.CH-,\N/\ cmonuon N/ -N can. 011/ H Ines, b t i l i I l SOINB In an analogous manner dyestuffs with similar properties result from the following components on the one hand, namely, N-hydroxyethylmethylaniline, N hydroxyethylethylaniline, N hydroxyethylorthotoluidine, N hydroxyethylmetatoluidine, N hydroxyethylbenzyltoluidine, N hydroxyethylbenzylaniline-sulfonic acid, etc., and on the other hand benzaldehyde1-sulfonic acid,

, benzaldehyde-l-sulfonic acid, benzaldehyde 2.4-d-isulfonic acid, 5-methylbenzaldehyde-- 2.- l-disulfonic acid, etc. The dyed materials produced by the action of the dyestuffs themselves 01' lakes thereof on the fibre or fabric, as well as the new dyestuffs-themselves or lakes thereof, form a part of the present invention.

I claim:

1. The new acid dyestuffs comprising products obtainable by condensation of aromatic aldehyde sulfonic acids with N-hydroxyethyl derivatives of aromatic secondary amines and subsequent oxidation, and having the following probable general formula uble in concentrated sulfuric acid generally with a yellowish to reddish coloration; yielding upon reduction with zinc and bydrochloric acid the corresponding leuco compounds; and dyeing green to blue shades on silk and on wool from an acid bath whereas cotton is left substantially unstained.

2. The new acid dyestuffs comprising products obtainable by condensation of arcmatic aldehyde sulfonic acids having a sulfo roup in the ortho position to the aldehyfe group with N-hydroxyethyl derivatives of aromatic secondary amines and subsequent oxidation, and having the following probable formula:

wherein R denotes an arylgroup, X a hydrogen atom which'may be substituted by an organic hydrocarbon radical which may contain a sulfo group, and R an aromatic nucleus substituted by at least one and not more than two sulfo groups and having at least one of said sulfo groups in the ortho position to the carbon atom which is attached to the central carbinol carbon atom; said dyestuffs being powders of a metallic lustre, soluble in, water generally with a greenish to bluish coloration, insoluble in ether and in ligroin, soluble in concentrated sulfuric acid generally with a yellowish to reddish coloration; yielding upon re duction with zinc and hydrochloric acid the corresponding leuco compounds; and d eing greenish-blue to blue shades on woo and on silk from an acid bath whereascotton is left almost untinged.

3. The new acid dyestuffs comprising products obtainable by condensation of benzaldehyde-2.5-disulfonic acid with N-hydroxyet'hyl derivatives of aromatic secondary amines and subsequent oxidation, and having the following probable formula:

wherein R denotes an aryl group and X a hydrogen atom which maybe substituted by an organic hydrocarbon radical which may contain a sulfo grou said dyestuffs being powders of a metallic lustre, soluble in water generally with a greenish to bluish coloration, insoluble in ether and in ligroin, soluble in concentrated sulfuric acid generally with a yellowish to reddish coloration;

yielding upon reduction with zinc and-hydrochloric acid the correspondin leuco and compounds; and dyeing. silk wool dis'L metaiiic in sure, so

. Eigro camp MM with 11 e and subseqrzen; prmc-- in, aolubla 

